Planetarium of Wan Shi Tong is a mythic Legendary Artifact card from Avatar: The Last Airbender (TLA), collector number 259. Current market price: $7.31 (foil $8.61), TCGplayer market prices via Scryfall.
{1}, {T}: Scry 2. Whenever you scry or surveil, look at the top card of your library. You may cast that card without paying its mana cost. Do this only once each turn. (Look at the card after you scry or surveil.)